Some aspects of a pilot’s job ___ be boring, and pilots often ___work at inconvenient hours.
| A．can; have to |
| B．may; can |
| C．have to; may |
| D．ought to; must |
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Some aspects of a pilot’s job ___ be boring, and pilots often ___work at inconvenient hours.
| A．can; have to |
| B．may; can |
| C．have to; may |
| D．ought to; must |
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